[Milsurplus] How Much Vacuum in "Vacuum Tubes?"

[James Duffer]

I can remember the old ads in Popular Electronics, Mechanix illustrated, 
etc. where you could go into business rebuilding old TV CRTs.  Probably a 
scam, I never knew anyone who responded to the ad and see what you would 
get.

73, Jim, wd4air
>From: "David Stinson" <arc5 at ix.netcom.com>
>Reply-To: David Stinson <arc5 at ix.netcom.com>
>To: "Old Tube Radios" <boatanchors at theporch.com>,"Milsurplus Radios" 
><milsurplus at mailman.qth.net>
>Subject: [Milsurplus] How Much Vacuum in "Vacuum Tubes?"
>Date: Wed, 28 Mar 2007 13:01:18 -0600
>
>"Vacuum" is a relative term.
>Just how much "vacuum" does one need to make a vacuum tube work?
>Our valves can't be at perfect vacuum; no way that thin glass
>would hold up.  So is it possible for an amatuer to create a
>vacuum pump and chamber good enough for tubes?
>Kinda thinking about how to recover rare or expensive
>tubes that have gone gassy or low-em.
>I have engraved-base, big-globe types 80 and 50
>that would look soooo good in a classic '20s homebrew,
>if only.....
>
>
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